-31.81% is the change from 830 to 566
Calculation steps:
[( 566 - 830 ) ÷ 830] x 100 = -31.81%
Formula
Percentage change = [(566 - 830) / 830] x 100
Subtract the new number by the original number
566 - 830 = -264
-264 ÷ 830 = -0.3180722891566265
-0.3180722891566265 x 100 = -31.81%